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Audio slideshow: Scala Santa

In Rome, 400-year-old fresco paintings in one of the most popular shrines in Christendom - obscured by thick grime and soot - have been restored to their original glory.

The BBC's Rome correspondent David Willey was given a tour of the building that is home to the Scala Santa or Holy Stairs. He spoke to Mary Angela Schroth, who is coordinating the 10-year restoration project.

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